We keep these guys in solitary confinement!They kill anything that moves, which is entertaining depending on the type of person you are.With out a doubt one of the most underrated interesting/hardy inverts out there.

Mantis are truly amazing creatures. Nearly fearless; I have a smallish (2" or so) Neogonodactylus wennerae still in my tank that hitchhiked in on my liverock. I was cleaning algae today and he didn't hesitate to attack the toothbrush I was cleaning the rocks with. Needless to say I'm cautious when putting bare skin near the rocks where he lives.

Jen, if you're interested in keeping a mantis species tank, in addition to Paul's excellent advice I'd also recommend looking at the Mantis Shrimp subforum on Reef Central. You'll find information from Dr. Roy Caldwell, a leading mantis biologist, well worth reading for anyone who wants to keep a mantis.